I hired Medieval Concrete Cleaning to remove the efflorescence from our block walls, wishing now I would have done it myself with a brush and some vinegar. Every wall that they cleaned with the pressure washer is now ruined. Not knowing how to use a pressure washer properly they etched into the blocks removing large amounts of material, leaving replacement of the blocks the only true fix. That's A LOT of money. Please see pictures attached and posted to Yelp. I also had them clean one half of the garage floor while they were here and that was mediocre at best... no attempt at some sort of barrier between the two sides was made, so the chemicals and water splashing and spraying, and the cleaning around of stuff made a mess and it looks like crap. Also I had them clean the paver section on our patio, again mediocre. With a round shape cleaning machine and a square patio, I'll let the reader imagine how the corners turned out. The wall outside our back door was cleaned differently using a sprayed on chemical, it now looks like a spray painted graffiti mess. I was told it would likely go away with time and after mentioning money I was given $50 off the bill. The total cost was then at $200. The cost for me to now make it look decent... I don't know. The cost for me to reverse the damage back to normal... what are block walls going for these days.? After staring at all this since April and realizing how bad it is, I had to post, and now fix.